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相关概念视频

Global Climate Change01:50

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Isothermal Processes01:21

Isothermal Processes

A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
Isochoric and Isobaric Processes01:21

Isochoric and Isobaric Processes

A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only. 
Suppose 1000 g of water is heated from 40 degrees...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Microbes and Climate Change01:27

Microbes and Climate Change

Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...

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相关实验视频

Updated: May 26, 2026

Using Generative Art to Convey Past and Future Climate Transitions
06:10

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

在最后一个冰河最大期期间,半球间冰盖的同步性.

Michael E Weber1, Peter U Clark, Werner Ricken

  • 1Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany. michael.weber@uni-koeln.de

Science (New York, N.Y.)
|December 7, 2011
PubMed
概括

南极和北半球冰盖的推进和撤退的时间是同步的,挑战了关于气候强迫的先前假设. 远程连接很可能同步了这些大规模的冰川事件跨越半球.

科学领域:

  • 古气候学 古气候学
  • 冰川学的冰川学
  • 四分学科学 四分学科学

背景情况:

  • 在过去的冰川时期,南极和北半球冰盖动态的同步并未得到充分理解.
  • 现有的模型表明,表面气候强迫应该导致半球之间的异步反应.

研究的目的:

  • 为了确定东南极冰盖的韦德尔海部门的精确时间表.
  • 将南极冰盖的时间与北半球冰盖进行比较.
  • 为了研究同步半球冰盖行为的机制.

主要方法:

  • 使用[在摘要中没有详细说明的具体方法]为韦德尔海部门制定新的时间表.
  • 整合新的南极数据与来自南极和其他北半球冰盖部门的现有时间表.
  • 分析潜在的远程连接,包括海平面强迫和北大西洋深水形成.

主要成果:

  • 韦德尔海冰盖的前进和后退与北半球大多数冰盖发生同步,在约会不确定性范围内.
  • 表面气候强迫本身无法解释观察到的同步.
  • 数据支持将北半球冰盖,海平面和北大西洋环流与南极冰盖接地线连接的远程连接.

结论:

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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

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Last Updated: May 26, 2026

Using Generative Art to Convey Past and Future Climate Transitions
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Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

Simulating Impacts of Ice Storms on Forest Ecosystems
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Simulating Impacts of Ice Storms on Forest Ecosystems

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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

Published on: October 26, 2019

  • 半球冰盖可能在同一时间前进和后退.
  • 由北半球冰盖动态驱动的海平面和海洋学变化,在同步南极冰盖方面发挥了至关重要的作用.
  • 这一发现对了解过去的气候变化和预测未来的冰盖反应有影响.